Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Electrochemical Behavior of Si/Cu/Graphite Composite Anode for Lithium Secondary Battery

리튬이차전지용 Si/Cu/Graphite 복합체 음극의 전기화학적 거동

  • Kim, Hyung-Sun (Battery Research Center, Korea Institute of Science and Technology) ;
  • Chung, Kyung-Yoon (Battery Research Center, Korea Institute of Science and Technology) ;
  • Cho, Won-Il (Battery Research Center, Korea Institute of Science and Technology) ;
  • Cho, Byung-Won (Battery Research Center, Korea Institute of Science and Technology)
  • 김형선 (한국과학기술연구원 이차전지연구센터) ;
  • 정경윤 (한국과학기술연구원 이차전지연구센터) ;
  • 조원일 (한국과학기술연구원 이차전지연구센터) ;
  • 조병원 (한국과학기술연구원 이차전지연구센터)
  • Published : 2009.05.30
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Abstract

The carbon-coated Si/Cu powders were synthesized by mechanical ball-milling and hydrocarbon gas decomposition methods at high temperature. The carbon-coated Si/Cu powder was used as anode for lithium secondary battery and its electrochemical behavior was investigated. In addition, the carbon-coated Si/Cu/graphite composite anode material was prepared using natural graphite powder and their electrochemical characteristics were compared with natural graphite anode. The specific capacity of carbon-coated Si/Cu anode increased to the initial 10 cycles. The carbon-coated Si/Cu/graphite composite anode exhibited the reversible specific capacity of 450mAh/g and the first cycle efficiency of 81.3% at $0.25mA/cm^2$. The cycling performance of the composite anode was similar to that of pure graphite anode except the reversible specific capacity value.

탄소 피복된 Si/Cu 분말을 기계적인 볼-밀링(ball-milling) 방법과 고온에서 탄화수소가스 분해 방법에 의해 제조하여 리튬이차전지용 음극으로 사용하였고 이에 대한 전기화학적 거동을 조사하였다. 천연흑연(natural graphite)을 이용하여 탄소 피복된 Si/Cu/graphite 복합체 음극소재를 제조하였으며 천연흑연 음극소재와 전기화학적 특성을 비교하였다. 탄소 피복된 Si/Cu 음극의 가역적 비용량은 초기 10 싸이클까지 지속적인 증가를 나타냈다. 탄소 피복된 Si/Cu/graphite 복합체 음극의 가역적 비용량은 $0.25mA/cm^2$ 전류밀도에서 450mAh/g이고 초기 싸이클 효율은 81.3%로 나타났다. 복합체 음극의 싸이클 성능은 가역적인 비용량값을 제외하고 천연흑연 음극과 유사하게 나타났다.

Keywords

References

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